One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,6)(4,11)(5,7)(8,12)(9,15)(10,13)(14,16)(18,22)(20,28)(23,25)(26,32)(35,41)(39,45)(42,47)(46,48) involution — undirected(1,3,5,10)(2,6,7,13)(4,9,12,16)(8,14,11,15)(17,18)(19,25)(20,24)(21,22)(23,27)(26,31)(28,29)(30,32)(34,38)(39,45)(40,43)(46,48)(2,7)(6,13)(8,11)(14,15)(17,18,21,22)(19,23,27,25)(20,24,28,29)(26,30,32,31)(33,34)(35,39)(36,40)(37,38)(41,45)(42,46)(43,44)(47,48)(1,2)(3,6)(4,8)(5,7)(9,14)(10,13)(11,12)(15,16)(17,18)(19,23)(20,24)(21,22)(25,27)(26,30)(28,29)(31,32)(33,35)(34,39)(36,42)(37,41)(38,45)(40,46)(43,48)(44,47) involution — undirected(1,3)(2,6)(4,9)(5,10)(7,13)(8,14)(11,15)(12,16)(17,19,21,27)(18,23,22,25)(20,26,28,32)(24,30,29,31)(33,34)(35,39)(36,43)(37,38)(40,44)(41,45)(42,48)(46,47)(1,4)(2,8)(3,9)(5,12)(6,14)(7,11)(10,16)(13,15)(17,20,21,28)(18,24,22,29)(19,26,27,32)(23,30,25,31)(33,36)(34,40)(35,42)(37,44)(38,43)(39,46)(41,47)(45,48)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.